There are multiple postings about that, but here’s the summary I wrote for myself:
# commands are run on the SBC, $ are run on your host
1. $ wget https://github.com/starfive-tech/VisionFive2/releases/download/VF2_v2.5.0/sdcard.img
2. Use your favorite method to write that image a µSDcard
3. Power-on with that in
4. Find with $IP and ssh root@$IP (pw: starfive)
5. get u-boot-spl.bin.normal.out and visionfive2_fw_payload.img from https://github.com/starfive-tech/VisionFive2/releases and scp from the SBC (it has very few binaries)
6. # flashcp -v u-boot-spl.bin.normal.out /dev/mtd0
7. # flashcp -v visionfive2_fw_payload.img /dev/mtd1
8. # shutdown -h now
9. Download starfive-jh7110-VF2_515_v2.5.0-69.img.bz2 from https://debian.starfivetech.com/ (use Google Cloud Disk)
10. $ bunzip2 starfive-jh7110-VF2_515_v2.5.0-69.img.bz2 and, again, use your favorite method to write that image a µSDcard
11. Insert in the board and power on.
12. Optional: if it fails to display on your monitor, you can log in over the network with ssh user@starfive (pw: starfive)
ADD: good thing I wrote the notes as I forget you have to log in as root to the buildroot image. Anyway, I hope it helps.